Dynamically link run-make support

src/tools/compiletest/src/runtest/run_make.rs

@@ -329,6 +329,7 @@ fn run_rmake_v2_test(&self) {
             .arg(format!("run_make_support={}", &support_lib_path.to_string_lossy()))
             .arg("--edition=2021")
             .arg(&self.testpaths.file.join("rmake.rs"))
+            .arg("-Cprefer-dynamic")
             // Provide necessary library search paths for rustc.
             .env(dylib_env_var(), &env::join_paths(host_dylib_search_paths).unwrap());
 

src/tools/run-make-support/Cargo.toml

@@ -13,3 +13,6 @@ gimli = "0.31.0"
 build_helper = { path = "../build_helper" }
 serde_json = "1.0"
 libc = "0.2"
+
+[lib]
+crate-type = ["lib", "dylib"]